Improvement in bronzing-machines



D. RESTON. v BRoNzING MACHINE.

Patented March 7, l18576.

:PATENT OFFICE.

DAVID HES'ION, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOR OF ONE- HALF Hrs RIGHT TonoBERT s. MENAMLN, oF SAME PLACE.

'IMPROVEMENf IN BRoNzlLNe-MACHINES.

Specification forming part of Letters PatentNo. 174,526, dated March 7, 1876; application filed June 23, 1875.

To all whom it may concern Be it known that I, DAVID HEs'roN, of the city and county of Philadelphia, in the State of Pennsylvania, have invented a new andA useful Improvement in Bronzing-Machines;

and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertainsito make and use the same,

reference being had to the` accompanying drawing', which forms a part of this specification, and in which- Figure lis a vertical longitudinal section of my improvement, taken through the middle of the machine. Fig. 2 is a transverse section thereof', taken lon the line 1 2, Fig, 1, and the lower part taken on the line 3 4, Fig. l. Fig. 3 is a plan or top view thereof, the casing beingI removed. Fig. 4 is a side view of the said improvement, and Fig. 5 is a trans- `verse section, on an enlarged scale, of the feeding-trough and scraper.

The same parts are denoted by the same letters in all the figures.

This invention consists, first, in the combination of a fountain or receptacle for bronzepowder and a scraper, which, by moving trans.- versely to and fro over the perforated bottom of said fountain, causesthc powder to fall through it onto the sheet to be bronzed; secondly, in the combination of a cylinder, covered with elastic material, and a griper hinged to said cylinder by a joint which is protected by said elastic covering, preventing the bronze from being brushed into the interior of the cylinder; thirdly, in the cmbination, with the griper, ofa spring which closes it, and an arm pivoted to said griper, and to anotherv is inclosed in a casing, B, within which is the bronzing-chamber O. One or more portions, D, of thiscylinder are hinged, as shown at E, in order to act as gripers, and the entire convex surface of the cylinder, including the parts D D, is covered with rubber or similar elastic material. To each hinged portion D is fastened, outside of this air-tight covering, a plate, which projects over the adjacent part of the cylinder, as shown in Fig. -1. At the top and near the front of the casing B is a long and narrow transverse opening, over which is placed the perforated bottom F of the feeding-trough G, the receptacle for the bronze-powder. His the reciproeatin g scraper, consisting of a horizontal blade adjustably bolted to arms c' i on the sliding rods I I. I prefer to insert bristles or brushes in the lower edge of H, as shown at h, Fig. 5. The height of the scraper above the bottom of the feeding-trough may be adjusted by the bolt j. J

is a shaft mounted ou the top of the machine,

and revolved by a band and pulley, as shown in Fig. 4. To this shaft are keyed eccentrics K K, which work within the jaWsL L, projecting from rods I I, which rods pass through holes in the sides ofthe feeding-trough, so that the revolution ofthe shaft J imparts to these rods and scraper H a reciprocating movement between the front and rear of the trough. The bottom of the trough may be closed, either wholly or partly, by means of the slides W W. i

The mechanism for operating the gripers is as follows: A rock-shaft, O, is mounted in the cylinder, and on the arm Q, projecting from said shaft, is a pin or friction-roller, R, which, as the cylinder revolves, comes into contact with' a cam, S, ou the inside of the casing, whereby the arm Q is lifted and shaft O rocked. To this rockshaft are rigidly secured the arms NN, and to cach arm N is pivotedrone end of an arm, P, whose other end is pivoted to a lug, M, projecting from the in- .ner surface of the griper. When theroller R comes into contact with the cam, as above described, the lower end of the arms N N is raised by the turning of shaft O, thereby raising the arms P P and opening the gripe?, as shown in Fig. l. As soon as the roller It has passed the cam the griper is closed by a spring, T, attached to an arm, N, and to the cylinder. The rockshaft is nearly in line with both pivots of arm P, as shown in Fig. l, mak-Y ing a toggle-joint to enable the sprin g T to act to the greatest advantage in closing the griper and holding the sheet tightly. The sides of the casin g B are prolonged to form brackets c t, which support the sliding table V whereon the paper to be bronzed is laid. This table is moved forward to deliver the paper to the griper at the proper time, by means of a rock-shaft, X, and arms, Y Y, rigidly keyed at one end to said shaft, and hinged or jointed at the other end to the table. The bearings ot the shaft X are in the brackets c c, and from one of its ends, outside of the bracket, projects a toe, Z, actuated by a rocker, A', which is supported by the frame or casing ot' the machine, and whose lower end depresses the toe Z, when its upper end, or a pin thereon, is elevated by an arm, B', keyed to the shaft of the cylinder A, and having a camsurface at its outer end. When the arm B' has passed the rocker the table is retracted by a spring, C".

Within the casing is arranged Aa series of brushes by which the bronze-powder is spread upon the sheet and the superfluous portion cleaned oi'; but, as these brushes and their arrangement within the case and mode of operation are old and well known, I do not def scribe them further or represent them in the drawing. To wipe the sheet thoroughly after it has been subjected `to the action of the aforementioned brushes, I employ a revolving wiper, C', consisting of pads-ot` rubber or other elastic material faced With fur, which, as they come into contact with the sheet moving in the opposite direction, bear lightly on its surface. D' is a gear on the shaft of the revolving wiper, meshing into a pinion, E', on whose shaft is a knocker, F'. The function of this knocker is to strike on the back of each of the pads of the wiper, and by the jar of the blow to remove the bronze-powder from the fur. Any convenient number of revolving wipers and knockers may be elnployed.

The operation of this improvement is as follows: Thetable'V being in the position shown in Fig. l, and the sheet Ato be bronzed having been laid thereon, the revolution of the cylinder and arm B' advances the table by the action of the cam at the end of B' against the upper end of rocker A', and the edge of the sheet is-thereby inserted between the projecting lips of the gripers and the surface of the cylinder under it. As the cylinder continues to revolve the roller R passes from the cam S, and the griper is instantly closed by spring T, and holds the sheet fast. As the sheet passes under the feeding-trough the scraper H, moving to and fro over the perforated bottom, agitates the bronze and scrapes or brushes it through' the pert'orations upon the sheet, and as the cylinder continues to revolve the sheet comes into contact with 'the brushes, by which the bronze is spread over it, and thesupertluous portion dusted oit, and it is nally wiped clean by the wiper C', and released when the griper is again opened by the operation of cam S and roller R. The hingejoint of the griper being covered with rubber or similar elastic material, so as to be air-tight, no powder can fall into the interior of the cylinder.

I do not claim in this specification a brush for feeding the powder through the perforated bottom ofthe fountain by a longitudinallyreciprocating movement, as shown in the drawing attached to my patent No. 150,037, of April 21, 1874.

What Iclaim as my invention, and desire to secureby Letters Patent of the United States, is-

1. The combination of the feeding-trough G and transversely-reciprocating scraper H, arranged to operate substantially-as described.

2. The combination, with the cylinder A, covered with elastic material,of the griper D, hinged to said cylinder by ajoint which is protected by the said elastic covering, substantially as described.

3. The combination, with the griper and spring T, ofthe rock-shaft O and arms P and N, constructed and arranged to operate substantially as shown and described.

et. The combination of the cylinder with the table V, arranged to operate substantially as and by the means described for feeding the sheet to the griper.

5. The combination of the Wiper C' and knocker F', constructed and arranged to operate substantially as described.

DAVID HESTON.

Witnesses:

C. B. HEs'rN, W. P. FEN'roN. 

